Ubuntu: Guest session processes are not confined in 16.10

Processes launched under a lightdm guest session are not confined by the /usr/lib/lightdm/lightdm-guest-session AppArmor profile in Ubuntu 16.10, Ubuntu 17.04, and Ubuntu Artful (current dev release). The processes are unconfined.

The simple test case is to log into a guest session, launch a terminal with ctrl-alt-t, and run the following command: